摘要
江汉盆地自加里东至印支期接受了一套较为稳定的台地相为主的碳酸盐岩沉积,侏罗纪末至燕山早一中期经受区域挤压,发生褶皱和逆冲;燕山晚期至喜马拉雅早—中期发生伸展作用,形成负反转构造;随后盆地进入坳陷期,沉积了广华寺组和平原组,期间发生过局部的褶皱隆升,形成正反转构造。喜马拉雅晚期为弱正反转构造期,使得喜马拉雅期的正断层具封闭性,有利于油气藏形成。盆地东部和中部的小板凹陷和潜江凹陷广泛发育局部褶皱剥蚀型的全正反转构造,反射波同相轴间呈喇叭口状,地层向断层方向有增厚趋势。盆地西部的当阳地区常发育上下皆逆和上逆下正的全正反转构造或上下皆凸的准正反转构造。总体上,构造反转具有东早西晚、东强西弱的特点。
YiXing//MOPG 1996(4):10～12 From Caledonian Movement to Indosinian Age,the Jianghan Basin took a set of stable deposits of carbonate rocks mainly in platform facies.From the end of Jurassic to the early/middle Yanshan Movement,regional compression took place forming folds and thrusts.In the late Yanshan Movement to the early/ middle Himalayan Cycle,the basin underwent extensional movement and formed reversal structures.Afterwards,it entered the downwarping period,the Guanghuasi and Pingyuan formations were deposited.Meantime,locally folding and doming took place,and positive reversal structures were formed.It was a weak positive reversion period in the late Himalayan Movement,and the normal faults of the Himalayan orogeny possess sealing ability favourable to form pools.The Xiaoban Sag and Qianjiang Sag in the east and middle parts of the basin extensively develop complete positive reversal structures of local folded-denuded pattern.The isopic axes of reflection wave of the structures appear the shape of horn mouths,and the stratigraphic thickness increase to the reversal faults.Overall,the structural reversion began early and developed intensely in the east,and late weak in the west of the basin.
出处
《海相油气地质》
1996年第4期10-12,共3页
Marine Origin Petroleum Geology
基金
85-102-14-04项目科研成果之一
关键词
逆断层
构造演化
江汉盆地
油气藏
油气运移
Structural interpretation
Seismic interpretation
Reversal structure
Tectonic evolution
Jianghan Basin
